Skip to content
ContractorsRanked

Emergency HVAC Contractors in Windham, CT (2026)

Top 50 of 222 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

24 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in Windham: CNM Heating Cooling Piping LLC, open 24/7.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

Top emergency HVAC contractors in Windham at a glance

Top emergency HVAC contractors in Windham at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1CNM Heating Cooling Piping LLC635.0★ (186)Storrs, 6 mi away24/7
2DTS Oil & Gas Service & Solutions LLC625.0★ (150)Hebron, 8 mi away24/7
3Degree Heating and Cooling614.8★ (1,302)Glastonbury, 22 mi away24/7
4Absolute Air Services, LLC614.9★ (1,027)Portland, 24 mi away24/7
5Corbett HVAC Services LLC614.4★ (80)Willimantic, 4 mi away24/7
6SM Mechanical Services LLC604.8★ (618)Glastonbury, 24 mi away24/7
7Sprague Heating & Cooling LLC595.0★ (8)Windham24/7
8Wyman Energy Services Inc.594.8★ (172)Manchester, 20 mi away24/7
9HVAC Restorations LLC.595.0★ (33)Norwich, 11 mi away24/7
10Kneeland heating & Cooling LLC584.6★ (169)Groton, 20 mi away24/7

Call an emergency HVAC contractor in Windham now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in Windham, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 222 is on the HVAC contractors page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  13. #13 Air Pro Services LLC

    Based in Plainfield, 7 mi away

    57/100CR Score

    Ranked #13 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “HVAC contractor”.

    • 4.6★ from 9 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    54 Woodchuck Hill Rd, Canterbury, CT 06331
    View profile for Air Pro Services LLC(860) 334-3031

  21. #21 Carnot Heating

    Based in Groton, 15 mi away

    55/100CR Score

    Ranked #21 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “HVAC contractor”.

    • 4.6★ from 9 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Carnot Heating(860) 917-5879

  22. #22 KSB Electric

    Based in Glastonbury Center, 15 mi away

    55/100CR Score

    Ranked #22 because of its Google rating and review volume: 5.0★ from 245 Google reviews.

    • 5.0★ from 245 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    59 Loomis Rd, Bolton, CT 06043
    View profile for KSB Electric(860) 854-3772

Top 50 of 222 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in Windham, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Russ Energy545.0★ (8)18 mi
27Controlled Mechanicals545.0★ (8)19 mi
28Cool Spaces Services545.0★ (15)23 mi
29Air Guarden545.0★ (59)9 mi
30Cundiff HVAC544.4★ (23)25 mi
31Preferred Propane543.6★ (14)20 mi
32Rapid Service LLC534.4★ (74)9 mi
33Wittig Mechanical, Llc533.7★ (9)22 mi
34Action Air Systems, Inc.533.2★ (9)21 mi
35Air Control Mechanical LLC535.0★ (4)21 mi
36Expert Services534.5★ (8)24 mi
37Reliable Mechanical Contractors523.0★ (10)22 mi
38Rainville Plumbing & Heating515.0★ (4)11 mi
39Petro Home Services494.1★ (119)25 mi
40David Robbin Plumbing & Heating495.0★ (7)24 mi
41Nutmeg Mechanical Services Inc.494.7★ (142)20 mi
4272 Degrees Air Conditioning & Heating484.2★ (16)6 mi
43W F Lebeau Plumbing & Heating484.6★ (7)4 mi
44BTW Plumbing, Heating, and Cooling LLC485.0★ (8)6 mi
45Villa & Sons474.0★ (4)3 mi
46Control/Temp473.3★ (4)3 mi
47TNT Heating & Cooling LLC465.0★ (9)11 mi
48Eastern Connecticut Heating464.5★ (26)18 mi
49Eric Sabo Plumbing Heating & Cooling, LLC.454.9★ (264)4 mi
50MDK Mechancial LLC455.0★ (3)9 mi

How we ranked emergency HVAC contractors in Windham

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in Windham: questions

Which HVAC contractors in Windham are open 24/7?

24 on this list post 24/7 hours, including CNM Heating Cooling Piping LLC, DTS Oil & Gas Service & Solutions LLC, Degree Heating and Cooling, Absolute Air Services, LLC and Corbett HVAC Services LLC.

Who is ranked #1 for emergency heating and cooling in Windham, CT?

CNM Heating Cooling Piping LLC is #1, with a CR Score of 63 out of 100 on emergency weights.

How are emergency HVAC contractors in Windham ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Windham

  1. October 2026: CR Scores recalculated for 222 hvac contractors serving Windham.
  2. October 2026: 3 duplicate listings merged.

More emergency and heating and cooling pages